Synchronous rectification control method and control circuit and switching voltage regulator
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsJun Chen, Jue Wang
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Abstract
In one embodiment, a synchronous rectification control method can include: (i) setting or updating a count value when a rectification switch is turned on; (ii) generating an off enable signal after a delay time corresponding to the count value has elapsed; (iii) turning off the rectification switch based on the off enable signal, and comparing a drain-source voltage of the rectification switch against a reference voltage; and (iv) generating a comparison signal for updating the count value based on the drain-source voltage and the reference voltage.
Claims15
A synchronous rectification control method, comprising:
- a) setting or updating a count value when a rectification switch is turned on;
- b) generating an off enable signal after a delay time corresponding to said count value has elapsed;
- c) turning off said rectification switch based on said off enable signal, and comparing a drain-source voltage of said rectification switch against a reference voltage;
- and
- d) generating a comparison signal for updating said count value based on said drain-source voltage and said reference voltage.
A synchronous rectification control circuit, comprising:
- a) a counting circuit configured to set or update a count value when a rectification switch is turned on;
- b) a delay circuit configured to receive said count value, and to generate an off enable signal after a delay time corresponding to said count value has elapsed;
- c) a main control circuit configured to receive said off enable signal, and to turn off said rectification switch according to said off enable signal;
- and
- d) a comparison circuit configured to compare a drain-source voltage of said rectification switch against a reference voltage after said rectification switch is turned off, and to provide a comparison signal to said counting circuit to update said count value.
Dependencies are inferred from the claim text.